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<a name="1" href="#1">1</a>   <em class="comment">/*</em>
<a name="2" href="#2">2</a>   <em class="comment"> * @(#)ClassUtils.java     9 Feb 2009</em>
<a name="3" href="#3">3</a>   <em class="comment"> * </em>
<a name="4" href="#4">4</a>   <em class="comment"> * Copyright © 2009 Andrew Phillips.</em>
<a name="5" href="#5">5</a>   <em class="comment"> *</em>
<a name="6" href="#6">6</a>   <em class="comment"> * ====================================================================</em>
<a name="7" href="#7">7</a>   <em class="comment"> * Licensed under the Apache License, Version 2.0 (the "License");</em>
<a name="8" href="#8">8</a>   <em class="comment"> * you may not use this file except in compliance with the License.</em>
<a name="9" href="#9">9</a>   <em class="comment"> * You may obtain a copy of the License at</em>
<a name="10" href="#10">10</a>  <em class="comment"> *</em>
<a name="11" href="#11">11</a>  <em class="comment"> * <a href="http://www.apache.org/licenses/LICENSE-2.0" target="alexandria_uri">http://www.apache.org/licenses/LICENSE-2.0</a></em>
<a name="12" href="#12">12</a>  <em class="comment"> *</em>
<a name="13" href="#13">13</a>  <em class="comment"> * Unless required by applicable law or agreed to in writing, software</em>
<a name="14" href="#14">14</a>  <em class="comment"> * distributed under the License is distributed on an "AS IS" BASIS,</em>
<a name="15" href="#15">15</a>  <em class="comment"> * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or </em>
<a name="16" href="#16">16</a>  <em class="comment"> * implied.</em>
<a name="17" href="#17">17</a>  <em class="comment"> * See the License for the specific language governing permissions and</em>
<a name="18" href="#18">18</a>  <em class="comment"> * limitations under the License.</em>
<a name="19" href="#19">19</a>  <em class="comment"> * ====================================================================</em>
<a name="20" href="#20">20</a>  <em class="comment"> */</em>
<a name="21" href="#21">21</a>  <strong>package</strong> com.qrmedia.commons.lang;
<a name="22" href="#22">22</a>  
<a name="23" href="#23">23</a>  <strong>import</strong> <strong>static</strong> com.qrmedia.commons.validation.ValidationUtils.checkNotNull;
<a name="24" href="#24">24</a>  
<a name="25" href="#25">25</a>  <strong>import</strong> java.lang.annotation.Annotation;
<a name="26" href="#26">26</a>  <strong>import</strong> java.lang.reflect.Field;
<a name="27" href="#27">27</a>  <strong>import</strong> java.lang.reflect.Method;
<a name="28" href="#28">28</a>  <strong>import</strong> java.lang.reflect.ParameterizedType;
<a name="29" href="#29">29</a>  <strong>import</strong> java.lang.reflect.Type;
<a name="30" href="#30">30</a>  <strong>import</strong> java.lang.reflect.TypeVariable;
<a name="31" href="#31">31</a>  <strong>import</strong> java.util.AbstractList;
<a name="32" href="#32">32</a>  <strong>import</strong> java.util.ArrayList;
<a name="33" href="#33">33</a>  <strong>import</strong> java.util.Arrays;
<a name="34" href="#34">34</a>  <strong>import</strong> java.util.Collection;
<a name="35" href="#35">35</a>  <strong>import</strong> java.util.Collections;
<a name="36" href="#36">36</a>  <strong>import</strong> java.util.HashMap;
<a name="37" href="#37">37</a>  <strong>import</strong> java.util.HashSet;
<a name="38" href="#38">38</a>  <strong>import</strong> java.util.LinkedList;
<a name="39" href="#39">39</a>  <strong>import</strong> java.util.List;
<a name="40" href="#40">40</a>  <strong>import</strong> java.util.Map;
<a name="41" href="#41">41</a>  <strong>import</strong> java.util.Set;
<a name="42" href="#42">42</a>  
<a name="43" href="#43">43</a>  <em>/**<em>*</em></em>
<a name="44" href="#44">44</a>  <em> * Utility methods for dealing with {@link Class Classes}.</em>
<a name="45" href="#45">45</a>  <em> * </em>
<a name="46" href="#46">46</a>  <em> * @author anph</em>
<a name="47" href="#47">47</a>  <em> * @since 9 Feb 2009</em>
<a name="48" href="#48">48</a>  <em> *</em>
<a name="49" href="#49">49</a>  <em> */</em>
<a name="50" href="#50">50</a>  <strong>public</strong> <strong>class</strong> <a href="../../../../com/qrmedia/commons/lang/ClassUtils.html">ClassUtils</a> {
<a name="51" href="#51">51</a>  
<a name="52" href="#52">52</a>      <em>/**<em>*</em></em>
<a name="53" href="#53">53</a>  <em>     * Returns &lt;u>one&lt;/u> of the possible chains of superclasses and/or interfaces joining the</em>
<a name="54" href="#54">54</a>  <em>     * specified class to the given superclass, as returned by {@link #getSuperclassChains(Class, Class)}.</em>
<a name="55" href="#55">55</a>  <em>     * &lt;i>Which&lt;/i> of the possible chains will be returned is not defined.</em>
<a name="56" href="#56">56</a>  <em>     * &lt;p></em>
<a name="57" href="#57">57</a>  <em>     * If &lt;code>superclass&lt;/code> is &lt;i>not&lt;/i> a superclass or -interface of &lt;code>class&lt;/code>,</em>
<a name="58" href="#58">58</a>  <em>     * the method returns &lt;code>null&lt;/code>. This may happen (in spite of the signature) if the </em>
<a name="59" href="#59">59</a>  <em>     * method is called with non-generic arguments.</em>
<a name="60" href="#60">60</a>  <em>     *</em>
<a name="61" href="#61">61</a>  <em>     * @param &lt;S>       the type of the superclass at the &amp;quot;end&amp;quot; of the chain</em>
<a name="62" href="#62">62</a>  <em>     * @param clazz     the class at the &amp;quot;start&amp;quot; of the superclass chain</em>
<a name="63" href="#63">63</a>  <em>     * @param superclass        the class at the &amp;quot;end&amp;quot; of the superclass chain</em>
<a name="64" href="#64">64</a>  <em>     * @return &lt;u>one&lt;/u> superclass chain linking &lt;code>class&lt;/code> to &lt;code>superclass&lt;/code>,</em>
<a name="65" href="#65">65</a>  <em>     *         where successive elements of the list are immediate superclasses or -interfaces. If</em>
<a name="66" href="#66">66</a>  <em>     *         &lt;code>class&lt;/code> is not a subclass of &lt;code>superclass&lt;/code>, returns &lt;code>null&lt;/code>.</em>
<a name="67" href="#67">67</a>  <em>     * @throws IllegalArgumentException if either argument is null    </em>
<a name="68" href="#68">68</a>  <em>     * @see #getSuperclassChains(Class, Class)    </em>
<a name="69" href="#69">69</a>  <em>     */</em>
<a name="70" href="#70">70</a>      <strong>public</strong> <strong>static</strong> &lt;S> List&lt;Class&lt;? <strong>extends</strong> S>> getSuperclassChain(Class&lt;? <strong>extends</strong> S> clazz, 
<a name="71" href="#71">71</a>              Class&lt;S> superclass) {
<a name="72" href="#72">72</a>          Set&lt;List&lt;Class&lt;? <strong>extends</strong> S>>> superclassChains = getSuperclassChainsInternal(clazz, superclass, <strong>true</strong>);
<a name="73" href="#73">73</a>          <strong>return</strong> (superclassChains.isEmpty() ? <strong>null</strong> : superclassChains.iterator().next());
<a name="74" href="#74">74</a>      }
<a name="75" href="#75">75</a>      
<a name="76" href="#76">76</a>      <em>/**<em>*</em></em>
<a name="77" href="#77">77</a>  <em>     * Returns the chain of superclass and/or interfaces from the specified class to the given</em>
<a name="78" href="#78">78</a>  <em>     * superclass. Either parameter may be an interface.</em>
<a name="79" href="#79">79</a>  <em>     * &lt;p></em>
<a name="80" href="#80">80</a>  <em>     * Each list in the resulting set contains immediate superclass elements in order, i.e. for</em>
<a name="81" href="#81">81</a>  <em>     * classes</em>
<a name="82" href="#82">82</a>  <em>     * </em>
<a name="83" href="#83">83</a>  <em>     * &lt;pre></em>
<a name="84" href="#84">84</a>  <em>     * class Foo {}</em>
<a name="85" href="#85">85</a>  <em>     * class Bar extends Foo {}</em>
<a name="86" href="#86">86</a>  <em>     * class Baz extends Bar {}</em>
<a name="87" href="#87">87</a>  <em>     * &lt;/pre></em>
<a name="88" href="#88">88</a>  <em>     * </em>
<a name="89" href="#89">89</a>  <em>     * &lt;code>getSuperclassChains(Baz.class, Foo.class)&lt;/code> will return one list, &lt;code>[Baz.class,</em>
<a name="90" href="#90">90</a>  <em>     * Bar.class, Foo.class]&lt;/code>.</em>
<a name="91" href="#91">91</a>  <em>     * &lt;p></em>
<a name="92" href="#92">92</a>  <em>     * If both parameters are classes, there can only be one possible chain. However, if the superclass</em>
<a name="93" href="#93">93</a>  <em>     * is an interface, there may be multiple possible inheritance chains. For instance, for</em>
<a name="94" href="#94">94</a>  <em>     * </em>
<a name="95" href="#95">95</a>  <em>     * &lt;pre></em>
<a name="96" href="#96">96</a>  <em>     * interface Foo {}</em>
<a name="97" href="#97">97</a>  <em>     * interface Bar1 extends Foo {}</em>
<a name="98" href="#98">98</a>  <em>     * interface Bar2 extends Foo {}</em>
<a name="99" href="#99">99</a>  <em>     * interface Baz extends Bar1, Bar2 {}</em>
<a name="100" href="#100">100</a> <em>     * &lt;/pre></em>
<a name="101" href="#101">101</a> <em>     * </em>
<a name="102" href="#102">102</a> <em>     * both &lt;code>[Baz.class, Bar1.class, Foo.class]&lt;/code> and &lt;code>[Baz.class, Bar2.class, Foo.class]&lt;/code></em>
<a name="103" href="#103">103</a> <em>     * are valid inheritance chains, and the method returns both.</em>
<a name="104" href="#104">104</a> <em>     * &lt;p></em>
<a name="105" href="#105">105</a> <em>     * If &lt;code>superclass&lt;/code> is &lt;i>not&lt;/i> a superclass or -interface of &lt;code>class&lt;/code>,</em>
<a name="106" href="#106">106</a> <em>     * the method returns an empty set. This may happen (in spite of the signature) if the </em>
<a name="107" href="#107">107</a> <em>     * method is called with non-generic arguments.</em>
<a name="108" href="#108">108</a> <em>     *</em>
<a name="109" href="#109">109</a> <em>     * @param &lt;S>       the type of the superclass at the &amp;quot;end&amp;quot; of the chain </em>
<a name="110" href="#110">110</a> <em>     * @param clazz     the class at the &amp;quot;start&amp;quot; of the superclass chain</em>
<a name="111" href="#111">111</a> <em>     * @param superclass        the class at the &amp;quot;end&amp;quot; of the superclass chain</em>
<a name="112" href="#112">112</a> <em>     * @return all possible superclass chains linking &lt;code>class&lt;/code> to &lt;code>superclass&lt;/code>,</em>
<a name="113" href="#113">113</a> <em>     *         where successive elements of the list are immediate superclasses or -interfaces. If</em>
<a name="114" href="#114">114</a> <em>     *         &lt;code>class&lt;/code> is not a subclass of &lt;code>superclass&lt;/code>, returns an empty set.</em>
<a name="115" href="#115">115</a> <em>     * @throws IllegalArgumentException if either argument is null  </em>
<a name="116" href="#116">116</a> <em>     * @see #getSuperclassChain(Class, Class)      </em>
<a name="117" href="#117">117</a> <em>     */</em>
<a name="118" href="#118">118</a>     <strong>public</strong> <strong>static</strong> &lt;S> Set&lt;List&lt;Class&lt;? <strong>extends</strong> S>>> getSuperclassChains(Class&lt;? <strong>extends</strong> S> clazz, Class&lt;S> superclass) {
<a name="119" href="#119">119</a>         <strong>return</strong> getSuperclassChainsInternal(clazz, superclass, false);
<a name="120" href="#120">120</a>     }
<a name="121" href="#121">121</a>     
<a name="122" href="#122">122</a>     <strong>private</strong> <strong>static</strong> &lt;S> Set&lt;List&lt;Class&lt;? <strong>extends</strong> S>>> getSuperclassChainsInternal(Class&lt;? <strong>extends</strong> S> clazz, 
<a name="123" href="#123">123</a>             Class&lt;S> superclass, <strong>boolean</strong> oneChainSufficient) {
<a name="124" href="#124">124</a>         checkNotNull(<span class="string">"'clazz' and 'superclass' may not be non-null"</span>, clazz, superclass);
<a name="125" href="#125">125</a>         
<a name="126" href="#126">126</a>         <strong>if</strong> (!superclass.isAssignableFrom(clazz)) {
<a name="127" href="#127">127</a>             <strong>return</strong> Collections.emptySet();
<a name="128" href="#128">128</a>         }
<a name="129" href="#129">129</a>         
<a name="130" href="#130">130</a>         <em class="comment">// interfaces only need to be considered if the superclass is an interface</em>
<a name="131" href="#131">131</a>         <strong>return</strong> ClassUtils.getSuperclassSubchains(clazz, superclass, 
<a name="132" href="#132">132</a>                 oneChainSufficient, superclass.isInterface());
<a name="133" href="#133">133</a>     }
<a name="134" href="#134">134</a>     
<a name="135" href="#135">135</a>     <em class="comment">// recursive method: gets the subchains from the given class to the target class</em>
<a name="136" href="#136">136</a>     @SuppressWarnings(<span class="string">"unchecked"</span>)
<a name="137" href="#137">137</a>     <strong>private</strong> <strong>static</strong> &lt;S> Set&lt;List&lt;Class&lt;? <strong>extends</strong> S>>> getSuperclassSubchains(
<a name="138" href="#138">138</a>             Class&lt;? <strong>extends</strong> S> subclass, Class&lt;S> superclass, <strong>boolean</strong> oneChainSufficient, 
<a name="139" href="#139">139</a>             <strong>boolean</strong> considerInterfaces) {
<a name="140" href="#140">140</a>         
<a name="141" href="#141">141</a>         <em class="comment">// base case: the subclass *is* the target class</em>
<a name="142" href="#142">142</a>         <strong>if</strong> (subclass.equals(superclass)) {
<a name="143" href="#143">143</a>             
<a name="144" href="#144">144</a>             <em class="comment">// since the list will be built from the *head*, a linked list is a good choice</em>
<a name="145" href="#145">145</a>             List&lt;Class&lt;? <strong>extends</strong> S>> subchain = <strong>new</strong> LinkedList&lt;Class&lt;? <strong>extends</strong> S>>();
<a name="146" href="#146">146</a>             subchain.add(subclass);
<a name="147" href="#147">147</a>             <strong>return</strong> Collections.singleton(subchain);
<a name="148" href="#148">148</a>         }
<a name="149" href="#149">149</a>         
<a name="150" href="#150">150</a>         <em class="comment">// recursive case: get all superclasses and, if required, interfaces and recurse</em>
<a name="151" href="#151">151</a>         Set&lt;Class&lt;? <strong>extends</strong> S>> supertypes = <strong>new</strong> HashSet&lt;Class&lt;? <strong>extends</strong> S>>();
<a name="152" href="#152">152</a>         
<a name="153" href="#153">153</a>         Class&lt;? <strong>extends</strong> S> immediateSuperclass = (Class&lt;? <strong>extends</strong> S>) subclass.getSuperclass();
<a name="154" href="#154">154</a>         
<a name="155" href="#155">155</a>         <em class="comment">// interfaces and Object don't have a superclass</em>
<a name="156" href="#156">156</a>         <strong>if</strong> (immediateSuperclass != <strong>null</strong>) {
<a name="157" href="#157">157</a>             supertypes.add(immediateSuperclass);
<a name="158" href="#158">158</a>         }
<a name="159" href="#159">159</a>         
<a name="160" href="#160">160</a>         <strong>if</strong> (considerInterfaces) {
<a name="161" href="#161">161</a>             supertypes.addAll(Arrays.asList((Class&lt;? <strong>extends</strong> S>[]) subclass.getInterfaces()));
<a name="162" href="#162">162</a>         }
<a name="163" href="#163">163</a>         
<a name="164" href="#164">164</a>         Set&lt;List&lt;Class&lt;? <strong>extends</strong> S>>> subchains = <strong>new</strong> HashSet&lt;List&lt;Class&lt;? <strong>extends</strong> S>>>();
<a name="165" href="#165">165</a>         
<a name="166" href="#166">166</a>         <strong>for</strong> (Class&lt;? <strong>extends</strong> S> supertype : supertypes) {
<a name="167" href="#167">167</a>             
<a name="168" href="#168">168</a>             <em class="comment">// the compiler complains if the type parameters to getSuperclassSubchains aren't specified </em>
<a name="169" href="#169">169</a>             Set&lt;List&lt;Class&lt;? <strong>extends</strong> S>>> subchainsFromSupertype = 
<a name="170" href="#170">170</a>                 ClassUtils.getSuperclassSubchains(supertype, superclass, 
<a name="171" href="#171">171</a>                         oneChainSufficient, considerInterfaces);
<a name="172" href="#172">172</a>             
<a name="173" href="#173">173</a>             <em class="comment">// each chain from the supertype results in a chain [current, subchain-from-super]</em>
<a name="174" href="#174">174</a>             <strong>if</strong> (!subchainsFromSupertype.isEmpty()) {
<a name="175" href="#175">175</a>                 
<a name="176" href="#176">176</a>                 <strong>if</strong> (oneChainSufficient) {
<a name="177" href="#177">177</a>                     ClassUtils.&lt;S>addSubchain(subchains, subclass, 
<a name="178" href="#178">178</a>                             subchainsFromSupertype.iterator().next());
<a name="179" href="#179">179</a>                     <strong>return</strong> subchains;
<a name="180" href="#180">180</a>                 } <strong>else</strong> {
<a name="181" href="#181">181</a>                     
<a name="182" href="#182">182</a>                     <strong>for</strong> (List&lt;Class&lt;? <strong>extends</strong> S>> subchainFromSupertype : subchainsFromSupertype) {
<a name="183" href="#183">183</a>                         ClassUtils.&lt;S>addSubchain(subchains, subclass, subchainFromSupertype);
<a name="184" href="#184">184</a>                     }
<a name="185" href="#185">185</a>                     
<a name="186" href="#186">186</a>                 }
<a name="187" href="#187">187</a>                 
<a name="188" href="#188">188</a>             }
<a name="189" href="#189">189</a>             
<a name="190" href="#190">190</a>         }
<a name="191" href="#191">191</a>         
<a name="192" href="#192">192</a>         <strong>return</strong> subchains;
<a name="193" href="#193">193</a>     }
<a name="194" href="#194">194</a> 
<a name="195" href="#195">195</a>     <em class="comment">// adds the class to the beginning of the subchain and stores this extended subchain</em>
<a name="196" href="#196">196</a>     <strong>private</strong> <strong>static</strong> &lt;T> <strong>void</strong> addSubchain(Set&lt;List&lt;Class&lt;? <strong>extends</strong> T>>> subchains, 
<a name="197" href="#197">197</a>             Class&lt;? <strong>extends</strong> T> clazz, List&lt;Class&lt;? <strong>extends</strong> T>> subchainFromSupertype) {
<a name="198" href="#198">198</a>         subchainFromSupertype.add(0, clazz);
<a name="199" href="#199">199</a>         subchains.add(subchainFromSupertype);
<a name="200" href="#200">200</a>     }
<a name="201" href="#201">201</a> 
<a name="202" href="#202">202</a>     <em>/**<em>*</em></em>
<a name="203" href="#203">203</a> <em>     * Determines if &lt;i>any&lt;/i> of the given superclasses is a superclass or -interface of the</em>
<a name="204" href="#204">204</a> <em>     * specified class. See {@link Class#isAssignableFrom(Class)}.</em>
<a name="205" href="#205">205</a> <em>     * </em>
<a name="206" href="#206">206</a> <em>     * @param superclasses      the superclasses and -interfaces to be tested against</em>
<a name="207" href="#207">207</a> <em>     * @param clazz     the class to be to be checked</em>
<a name="208" href="#208">208</a> <em>     * @return  &lt;code>true&lt;/code> iff &lt;i>any&lt;/i> of the given classes is a superclass or -interface</em>
<a name="209" href="#209">209</a> <em>     *          of the specified class</em>
<a name="210" href="#210">210</a> <em>     * @throws IllegalArgumentException if either of the arguments is null</em>
<a name="211" href="#211">211</a> <em>     */</em>
<a name="212" href="#212">212</a>     <strong>public</strong> <strong>static</strong> <strong>boolean</strong> isAnyAssignableFrom(Collection&lt;Class&lt;?>> superclasses,
<a name="213" href="#213">213</a>             Class&lt;?> clazz) {
<a name="214" href="#214">214</a>         checkNotNull(<span class="string">"All arguments must be non-null"</span>, superclasses, clazz);
<a name="215" href="#215">215</a> 
<a name="216" href="#216">216</a>         <strong>for</strong> (Class&lt;?> superclass : superclasses) {
<a name="217" href="#217">217</a>             
<a name="218" href="#218">218</a>             <strong>if</strong> (superclass.isAssignableFrom(clazz)) {
<a name="219" href="#219">219</a>                 <strong>return</strong> <strong>true</strong>;
<a name="220" href="#220">220</a>             }
<a name="221" href="#221">221</a>             
<a name="222" href="#222">222</a>         }
<a name="223" href="#223">223</a>         
<a name="224" href="#224">224</a>         <strong>return</strong> false;
<a name="225" href="#225">225</a>     }
<a name="226" href="#226">226</a>     
<a name="227" href="#227">227</a>     <em>/**<em>*</em></em>
<a name="228" href="#228">228</a> <em>     * Determines if the specified object is assignment-compatible</em>
<a name="229" href="#229">229</a> <em>     * with &lt;em>any&lt;/em> of the specified {@code Class Classes}. class. </em>
<a name="230" href="#230">230</a> <em>     * See {@link Class#isInstance(Object)}.</em>
<a name="231" href="#231">231</a> <em>     * </em>
<a name="232" href="#232">232</a> <em>     * @param superclasses      the superclasses and -interfaces to be tested against</em>
<a name="233" href="#233">233</a> <em>     * @param instance     the object to be to be checked</em>
<a name="234" href="#234">234</a> <em>     * @return  &lt;code>true&lt;/code> iff the object is an instance of &lt;i>any&lt;/i> of the </em>
<a name="235" href="#235">235</a> <em>     *          given classes interfaces</em>
<a name="236" href="#236">236</a> <em>     * @throws IllegalArgumentException if either of the arguments is null</em>
<a name="237" href="#237">237</a> <em>     */</em>
<a name="238" href="#238">238</a>     <strong>public</strong> <strong>static</strong> <strong>boolean</strong> isInstance(Collection&lt;Class&lt;?>> superclasses,
<a name="239" href="#239">239</a>             Object instance) {
<a name="240" href="#240">240</a>         checkNotNull(<span class="string">"Superclasses non-null"</span>, superclasses);
<a name="241" href="#241">241</a> 
<a name="242" href="#242">242</a>         <strong>for</strong> (Class&lt;?> superclass : superclasses) {
<a name="243" href="#243">243</a>             
<a name="244" href="#244">244</a>             <strong>if</strong> (superclass.isInstance(instance)) {
<a name="245" href="#245">245</a>                 <strong>return</strong> <strong>true</strong>;
<a name="246" href="#246">246</a>             }
<a name="247" href="#247">247</a>             
<a name="248" href="#248">248</a>         }
<a name="249" href="#249">249</a>         
<a name="250" href="#250">250</a>         <strong>return</strong> false;
<a name="251" href="#251">251</a>     }
<a name="252" href="#252">252</a>     
<a name="253" href="#253">253</a>     <em>/**<em>*</em></em>
<a name="254" href="#254">254</a> <em>     * Collects all fields declared in the given class &lt;u>and&lt;/u> inherited from </em>
<a name="255" href="#255">255</a> <em>     * parents.</em>
<a name="256" href="#256">256</a> <em>     * </em>
<a name="257" href="#257">257</a> <em>     * @param clazz the class to parse</em>
<a name="258" href="#258">258</a> <em>     * @return  a list of all fields declared in the class or its  parents, in the </em>
<a name="259" href="#259">259</a> <em>     *          order determined by successive {@link Class#getDeclaredFields()}</em>
<a name="260" href="#260">260</a> <em>     *          calls</em>
<a name="261" href="#261">261</a> <em>     * @see #getAllDeclaredFields(Class, Class)          </em>
<a name="262" href="#262">262</a> <em>     */</em>
<a name="263" href="#263">263</a>     <strong>public</strong> <strong>static</strong> List&lt;Field> getAllDeclaredFields(Class&lt;?> clazz) {
<a name="264" href="#264">264</a>         <strong>return</strong> getAllDeclaredFields(clazz, Object.<strong>class</strong>);
<a name="265" href="#265">265</a>     }
<a name="266" href="#266">266</a> 
<a name="267" href="#267">267</a>     <em>/**<em>*</em></em>
<a name="268" href="#268">268</a> <em>     * Collects all fields declared in the given class &lt;u>and&lt;/u> inherited from </em>
<a name="269" href="#269">269</a> <em>     * parents &lt;strong>up to and including the given parent class&lt;/strong>.</em>
<a name="270" href="#270">270</a> <em>     * </em>
<a name="271" href="#271">271</a> <em>     * @param &lt;T> the type of the class to parse</em>
<a name="272" href="#272">272</a> <em>     * @param clazz the class to parse</em>
<a name="273" href="#273">273</a> <em>     * @param superclass the superclass of the class to parse at which traversal should be</em>
<a name="274" href="#274">274</a> <em>     *                   stopped</em>
<a name="275" href="#275">275</a> <em>     * @return  a list of all fields declared in the class or its parents up to and including</em>
<a name="276" href="#276">276</a> <em>     *          the given parent class, in the order determined by successive </em>
<a name="277" href="#277">277</a> <em>     *          {@link Class#getDeclaredFields()} calls</em>
<a name="278" href="#278">278</a> <em>     * @see #getAllDeclaredFields(Class)         </em>
<a name="279" href="#279">279</a> <em>     */</em>
<a name="280" href="#280">280</a>     <strong>public</strong> <strong>static</strong> &lt;T> List&lt;Field> getAllDeclaredFields(Class&lt;T> clazz, 
<a name="281" href="#281">281</a>             Class&lt;? <strong>super</strong> T> <strong>super</strong><strong>class</strong>) {
<a name="282" href="#282">282</a>         <strong>final</strong> List&lt;Field> fields = <strong>new</strong> ArrayList&lt;Field>();
<a name="283" href="#283">283</a>         
<a name="284" href="#284">284</a>         <strong>for</strong> (Class&lt;?> immediateSuperclass : getSuperclassChain(clazz, superclass)) {
<a name="285" href="#285">285</a>             fields.addAll(Arrays.asList(immediateSuperclass.getDeclaredFields()));
<a name="286" href="#286">286</a>         }
<a name="287" href="#287">287</a>         
<a name="288" href="#288">288</a>         <strong>return</strong> fields;
<a name="289" href="#289">289</a>     }
<a name="290" href="#290">290</a>     
<a name="291" href="#291">291</a>     <em>/**<em>*</em></em>
<a name="292" href="#292">292</a> <em>     * Collects all fields declared in the given class &lt;u>and&lt;/u> inherited from </em>
<a name="293" href="#293">293</a> <em>     * parents that are annotated with an annotation of the given type.</em>
<a name="294" href="#294">294</a> <em>     * </em>
<a name="295" href="#295">295</a> <em>     * @param clazz the class to parse</em>
<a name="296" href="#296">296</a> <em>     * @param annotationType the non-{@code null} type (class) of the annotation required</em>
<a name="297" href="#297">297</a> <em>     * @return  a list of all fields declared in the class or its  parents, in the </em>
<a name="298" href="#298">298</a> <em>     *          order determined by successive {@link Class#getDeclaredFields()}</em>
<a name="299" href="#299">299</a> <em>     *          calls</em>
<a name="300" href="#300">300</a> <em>     * @throws IllegalArgumentException if {@code clazz} or {@code annotationType} is {@code null}          </em>
<a name="301" href="#301">301</a> <em>     */</em>
<a name="302" href="#302">302</a>     <strong>public</strong> <strong>static</strong> List&lt;Field> getAllAnnotatedDeclaredFields(Class&lt;?> clazz, 
<a name="303" href="#303">303</a>             Class&lt;? <strong>extends</strong> Annotation> annotationType) {
<a name="304" href="#304">304</a>         checkNotNull(<span class="string">"All arguments must be non-null"</span>, clazz, annotationType);
<a name="305" href="#305">305</a>         
<a name="306" href="#306">306</a>         <strong>final</strong> List&lt;Field> annotatedFields = <strong>new</strong> ArrayList&lt;Field>();
<a name="307" href="#307">307</a>         
<a name="308" href="#308">308</a>         <strong>for</strong> (Field field : getAllDeclaredFields(clazz)) {
<a name="309" href="#309">309</a>             
<a name="310" href="#310">310</a>             <strong>if</strong> (field.isAnnotationPresent(annotationType)) {
<a name="311" href="#311">311</a>                 annotatedFields.add(field);
<a name="312" href="#312">312</a>             }
<a name="313" href="#313">313</a>             
<a name="314" href="#314">314</a>         }
<a name="315" href="#315">315</a>         
<a name="316" href="#316">316</a>         <strong>return</strong> annotatedFields;
<a name="317" href="#317">317</a>     }
<a name="318" href="#318">318</a>     
<a name="319" href="#319">319</a>     <em>/**<em>*</em></em>
<a name="320" href="#320">320</a> <em>     * Collects all methods of the given class (as returned by {@link Class#getMethods()} that </em>
<a name="321" href="#321">321</a> <em>     * are annotated with the given annotation.</em>
<a name="322" href="#322">322</a> <em>     * </em>
<a name="323" href="#323">323</a> <em>     * @param clazz     the class whose methods should be returned</em>
<a name="324" href="#324">324</a> <em>     * @param annotationType        the annotation that the returned methods should be annotated with</em>
<a name="325" href="#325">325</a> <em>     * @return  the methods of the given class annotated with the given annotation</em>
<a name="326" href="#326">326</a> <em>     * @throws IllegalArgumentException if {@code clazz} is {@code null}</em>
<a name="327" href="#327">327</a> <em>     */</em>
<a name="328" href="#328">328</a>     <strong>public</strong> <strong>static</strong> Set&lt;Method> getAnnotatedMethods(Class&lt;?> clazz, 
<a name="329" href="#329">329</a>             Class&lt;? <strong>extends</strong> Annotation> annotationType) {
<a name="330" href="#330">330</a>         checkNotNull(<span class="string">"'clazz' must be non-null"</span>, clazz);
<a name="331" href="#331">331</a>         
<a name="332" href="#332">332</a>         <em class="comment">// perhaps this case should throw an exception, but an empty list also seems sensible </em>
<a name="333" href="#333">333</a>         <strong>if</strong> (annotationType == <strong>null</strong>) {
<a name="334" href="#334">334</a>             <strong>return</strong> <strong>new</strong> HashSet&lt;Method>();
<a name="335" href="#335">335</a>         }
<a name="336" href="#336">336</a>         
<a name="337" href="#337">337</a>         Set&lt;Method> annotatedMethods = <strong>new</strong> HashSet&lt;Method>();
<a name="338" href="#338">338</a>         
<a name="339" href="#339">339</a>         <strong>for</strong> (Method method : clazz.getMethods()) {
<a name="340" href="#340">340</a>             
<a name="341" href="#341">341</a>             <strong>if</strong> (method.isAnnotationPresent(annotationType)) {
<a name="342" href="#342">342</a>                 annotatedMethods.add(method);
<a name="343" href="#343">343</a>             }
<a name="344" href="#344">344</a>             
<a name="345" href="#345">345</a>         }
<a name="346" href="#346">346</a>         
<a name="347" href="#347">347</a>         <strong>return</strong> annotatedMethods;
<a name="348" href="#348">348</a>     }
<a name="349" href="#349">349</a>     
<a name="350" href="#350">350</a>     <em>/**<em>*</em></em>
<a name="351" href="#351">351</a> <em>     * Retrieves the type arguments of a class when regarded as an subclass of the</em>
<a name="352" href="#352">352</a> <em>     * given typed superclass or interface. The order of the runtime type classes matches the order</em>
<a name="353" href="#353">353</a> <em>     * of the type variables in the declaration of the typed superclass or interface.</em>
<a name="354" href="#354">354</a> <em>     * &lt;p></em>
<a name="355" href="#355">355</a> <em>     * For example, for the classes</em>
<a name="356" href="#356">356</a> <em>     * </em>
<a name="357" href="#357">357</a> <em>     * &lt;pre></em>
<a name="358" href="#358">358</a> <em>     * class Foo&amp;lt;U, V&amp;gt; {}</em>
<a name="359" href="#359">359</a> <em>     * class Bar&amp;lt;W&amp;gt; extends Foo&amp;lt;String, W&amp;gt; {}</em>
<a name="360" href="#360">360</a> <em>     * class Baz extends Bar&amp;lt;Long&amp;gt;</em>
<a name="361" href="#361">361</a> <em>     * &lt;/pre></em>
<a name="362" href="#362">362</a> <em>     * </em>
<a name="363" href="#363">363</a> <em>     * and a &lt;code>typedClass&lt;/code> argument of &lt;code>Baz.class&lt;/code>, the method should return</em>
<a name="364" href="#364">364</a> <em>     * &lt;p></em>
<a name="365" href="#365">365</a> <em>     * &lt;ul></em>
<a name="366" href="#366">366</a> <em>     * &lt;li>&lt;code>[String, Long]&lt;/code> for a &lt;code>typedSuperclass&lt;/code> argument of &lt;code>Foo.class&lt;/code>,</em>
<a name="367" href="#367">367</a> <em>     *     and</em>
<a name="368" href="#368">368</a> <em>     * &lt;li>&lt;code>[Long]&lt;/code> if &lt;code>typedSuperclass&lt;/code> is &lt;code>Bar.class&lt;/code>.</em>
<a name="369" href="#369">369</a> <em>     * &lt;/ul></em>
<a name="370" href="#370">370</a> <em>     * For type parameters that cannot be determined, &lt;code>null&lt;/code> is returned.</em>
<a name="371" href="#371">371</a> <em>     * &lt;p></em>
<a name="372" href="#372">372</a> <em>     * &lt;b>Note:&lt;/b> It is &lt;u>not&lt;/u> possible to retrieve type information that is not available</em>
<a name="373" href="#373">373</a> <em>     * in the (super)class hierarchy at &lt;u>compile&lt;/u>-time. Calling </em>
<a name="374" href="#374">374</a> <em>     * &lt;code>getActualTypeArguments(new ArrayList&amp;lt;String&amp;gt;().getClass(), List.class)&lt;/code> will, </em>
<a name="375" href="#375">375</a> <em>     * for instance, return &lt;code>[null]&lt;/code> because the specification of the actual type </em>
<a name="376" href="#376">376</a> <em>     * (&lt;code>String&lt;/code>, in this example) did not take place either in the superclass {@link AbstractList} </em>
<a name="377" href="#377">377</a> <em>     * or the interface {@link List}.</em>
<a name="378" href="#378">378</a> <em>     * &lt;p></em>
<a name="379" href="#379">379</a> <em>     * If {@code superclass} is &lt;em>not&lt;/em> a superclass or -interface of {@code class},</em>
<a name="380" href="#380">380</a> <em>     * the method returns {@code null}. This may happen (in spite of the signature) if the </em>
<a name="381" href="#381">381</a> <em>     * method is called with non-generic arguments.</em>
<a name="382" href="#382">382</a> <em>     * </em>
<a name="383" href="#383">383</a> <em>     * @param &lt;S>       the type of the object</em>
<a name="384" href="#384">384</a> <em>     * @param typedClass the class for which type information is required</em>
<a name="385" href="#385">385</a> <em>     * @param typedSuperclass the typed class or interface of which the object is to be regarded a </em>
<a name="386" href="#386">386</a> <em>     *                        subclass</em>
<a name="387" href="#387">387</a> <em>     * @return  the type arguments for the given class when regarded as a subclass of the</em>
<a name="388" href="#388">388</a> <em>     *          given typed superclass, in the order defined in the superclass. If</em>
<a name="389" href="#389">389</a> <em>     *          {@code class} is not a subclass of {@code superclass}, returns {@code null}.</em>
<a name="390" href="#390">390</a> <em>     * @throws IllegalArgumentException if &lt;code>typedSuperclass&lt;/code> or &lt;code>typedClass&lt;/code> </em>
<a name="391" href="#391">391</a> <em>     *                                  is &lt;code>null&lt;/code>         </em>
<a name="392" href="#392">392</a> <em>     */</em>
<a name="393" href="#393">393</a>     <strong>public</strong> <strong>static</strong> &lt;S> List&lt;Class&lt;?>> getActualTypeArguments(Class&lt;? <strong>extends</strong> S> typedClass,
<a name="394" href="#394">394</a>             Class&lt;S> typedSuperclass) {
<a name="395" href="#395">395</a>         checkNotNull(<span class="string">"All arguments must be non-null"</span>, typedSuperclass, typedClass);
<a name="396" href="#396">396</a>         
<a name="397" href="#397">397</a>         <em class="comment">/*</em>
<a name="398" href="#398">398</a> <em class="comment">         * The type signature should ensure that the class really *is* an subclass of </em>
<a name="399" href="#399">399</a> <em class="comment">         * typedSuperclass, but this can be circumvented by using "generic-less" arguements.</em>
<a name="400" href="#400">400</a> <em class="comment">         */</em>
<a name="401" href="#401">401</a>         <strong>if</strong> (!typedSuperclass.isAssignableFrom(typedClass)) {
<a name="402" href="#402">402</a>             <strong>return</strong> <strong>null</strong>;
<a name="403" href="#403">403</a>         }
<a name="404" href="#404">404</a> 
<a name="405" href="#405">405</a>         TypeVariable&lt;?>[] typedClassTypeParams = typedSuperclass.getTypeParameters();
<a name="406" href="#406">406</a>         
<a name="407" href="#407">407</a>         <em class="comment">// if the class has no parameters, return</em>
<a name="408" href="#408">408</a>         <strong>if</strong> (typedClassTypeParams.length == 0) {
<a name="409" href="#409">409</a>             <strong>return</strong> <strong>new</strong> ArrayList&lt;Class&lt;?>>(0);
<a name="410" href="#410">410</a>         }
<a name="411" href="#411">411</a>         
<a name="412" href="#412">412</a>         <em class="comment">/*</em>
<a name="413" href="#413">413</a> <em class="comment">         * It would be nice if the parent class simply "aggregated" all the type variable</em>
<a name="414" href="#414">414</a> <em class="comment">         * assignments that happen in subclasses. In other words, it would be nice if, in the</em>
<a name="415" href="#415">415</a> <em class="comment">         * example in the JavaDoc, new Baz().getClass().getSuperclass().getGenericSuperclass()</em>
<a name="416" href="#416">416</a> <em class="comment">         * would return [String, Long] as actual type arguments.</em>
<a name="417" href="#417">417</a> <em class="comment">         * Unfortunately, though, it returns [String, W], because the assignment of Long to W</em>
<a name="418" href="#418">418</a> <em class="comment">         * isn't accessible to Bar. W's value is available from new Baz().getClass().getGenericSuperclass(),</em>
<a name="419" href="#419">419</a> <em class="comment">         * and must be "remembered" as we traverse the object hierarchy.</em>
<a name="420" href="#420">420</a> <em class="comment">         * Note, though, that the "variable substitution" of W (the variable used in Bar) for V (the</em>
<a name="421" href="#421">421</a> <em class="comment">         * equivalent variable in Foo) *is* propagated, but only to the immediate parent!</em>
<a name="422" href="#422">422</a> <em class="comment">         */</em>
<a name="423" href="#423">423</a>         Map&lt;TypeVariable&lt;?>, Class&lt;?>> typeAssignments = 
<a name="424" href="#424">424</a>             <strong>new</strong> HashMap&lt;TypeVariable&lt;?>, Class&lt;?>>(typedClassTypeParams.length);
<a name="425" href="#425">425</a>         
<a name="426" href="#426">426</a>         <em class="comment">/*</em>
<a name="427" href="#427">427</a> <em class="comment">         * Get one possible path from the typed class to the typed superclass. For classes, there</em>
<a name="428" href="#428">428</a> <em class="comment">         * is only one (the superclass chain), but for interfaces there may be multiple. We only</em>
<a name="429" href="#429">429</a> <em class="comment">         * need one, however (and it doesn't matter which one) since the compiler does not allow</em>
<a name="430" href="#430">430</a> <em class="comment">         * inheritance chains with conflicting generic type information.</em>
<a name="431" href="#431">431</a> <em class="comment">         */</em>
<a name="432" href="#432">432</a>         List&lt;Class&lt;? <strong>extends</strong> S>> superclassChain = getSuperclassChain(typedClass, typedSuperclass);
<a name="433" href="#433">433</a>         
<a name="434" href="#434">434</a>         assert (superclassChain != <strong>null</strong>) : Arrays.&lt;Class&lt;?>>asList(typedSuperclass, typedClass);
<a name="435" href="#435">435</a>         
<a name="436" href="#436">436</a>         <em class="comment">/*</em>
<a name="437" href="#437">437</a> <em class="comment">         * The list is ordered so that successive elements are immediate superclasses. The iteration</em>
<a name="438" href="#438">438</a> <em class="comment">         * stops with the class whose *superclass* is the last element, because type information</em>
<a name="439" href="#439">439</a> <em class="comment">         * is collected from the superclass.</em>
<a name="440" href="#440">440</a> <em class="comment">         */</em>
<a name="441" href="#441">441</a>         <strong>for</strong> (<strong>int</strong> i = 0; i &lt; superclassChain.size() - 1; i++) {
<a name="442" href="#442">442</a>             collectAssignments(superclassChain.get(i), superclassChain.get(i + 1), typeAssignments);
<a name="443" href="#443">443</a>         }
<a name="444" href="#444">444</a>         
<a name="445" href="#445">445</a>         <em class="comment">// will contain null for entries for which no class could be resolved</em>
<a name="446" href="#446">446</a>         <strong>return</strong> getActualAssignments(typedClassTypeParams, typeAssignments);
<a name="447" href="#447">447</a>     }
<a name="448" href="#448">448</a> 
<a name="449" href="#449">449</a>     <strong>private</strong> <strong>static</strong> <strong>void</strong> collectAssignments(Class&lt;?> clazz, Class&lt;?> supertype,
<a name="450" href="#450">450</a>             Map&lt;TypeVariable&lt;?>, Class&lt;?>> typeAssignments) {
<a name="451" href="#451">451</a>         TypeVariable&lt;?>[] typeParameters = supertype.getTypeParameters();
<a name="452" href="#452">452</a>         
<a name="453" href="#453">453</a>         <em class="comment">// the superclass is not necessarily a generic class</em>
<a name="454" href="#454">454</a>         <strong>if</strong> (typeParameters.length == 0) {
<a name="455" href="#455">455</a>             <strong>return</strong>;
<a name="456" href="#456">456</a>         }
<a name="457" href="#457">457</a>         
<a name="458" href="#458">458</a>         Type[] actualTypeAttributes = getActualTypeAttributes(clazz, supertype);
<a name="459" href="#459">459</a> 
<a name="460" href="#460">460</a>         assert (typeParameters.length == actualTypeAttributes.length) 
<a name="461" href="#461">461</a>         : Arrays.asList(typeParameters, typeAssignments);
<a name="462" href="#462">462</a>         
<a name="463" href="#463">463</a>         <em class="comment">// matches up type parameters with their actual assignments, assuming the order is the same!</em>
<a name="464" href="#464">464</a>         <strong>for</strong> (<strong>int</strong> i = 0; i &lt; actualTypeAttributes.length; i++) {
<a name="465" href="#465">465</a>             Type type = actualTypeAttributes[i];
<a name="466" href="#466">466</a>             
<a name="467" href="#467">467</a>             <em class="comment">/*</em>
<a name="468" href="#468">468</a> <em class="comment">             * type will be a Class or ParameterizedType if the actual type is known, </em>
<a name="469" href="#469">469</a> <em class="comment">             * and a TypeVariable if not.</em>
<a name="470" href="#470">470</a> <em class="comment">             */</em>
<a name="471" href="#471">471</a>             <strong>if</strong> (type instanceof Class) {
<a name="472" href="#472">472</a>                 typeAssignments.put(typeParameters[i], (Class&lt;?>) type);
<a name="473" href="#473">473</a>             } <strong>else</strong> <strong>if</strong> (type instanceof ParameterizedType) {
<a name="474" href="#474">474</a>                 assert (((ParameterizedType) type).getRawType() instanceof Class) : type;
<a name="475" href="#475">475</a>                 typeAssignments.put(typeParameters[i], 
<a name="476" href="#476">476</a>                         (Class&lt;?>) ((ParameterizedType) type).getRawType());
<a name="477" href="#477">477</a>             } <strong>else</strong> {
<a name="478" href="#478">478</a>                 assert (type instanceof TypeVariable&lt;?>) : type;
<a name="479" href="#479">479</a>                 
<a name="480" href="#480">480</a>                 <em class="comment">/*</em>
<a name="481" href="#481">481</a> <em class="comment">                 * The actual type arguments consist of classes and type variables from the</em>
<a name="482" href="#482">482</a> <em class="comment">                 * immediate child class. So if the type assignment mapping is updated to</em>
<a name="483" href="#483">483</a> <em class="comment">                 * contain the mapping of all type variables of the *current* class to</em>
<a name="484" href="#484">484</a> <em class="comment">                 * their classes, then these can be used in the *next* iteration to resolve</em>
<a name="485" href="#485">485</a> <em class="comment">                 * any variable "left over" from this round.</em>
<a name="486" href="#486">486</a> <em class="comment">                 * </em>
<a name="487" href="#487">487</a> <em class="comment">                 * Any variables that cannot be resolved in this round are not resolvable, otherwise</em>
<a name="488" href="#488">488</a> <em class="comment">                 * the would have been resolved in the previous round.</em>
<a name="489" href="#489">489</a> <em class="comment">                 */</em>
<a name="490" href="#490">490</a>                 <strong>if</strong> (typeAssignments.containsKey(type)) {
<a name="491" href="#491">491</a>                     typeAssignments.put(typeParameters[i], typeAssignments.get(type));
<a name="492" href="#492">492</a>                 }
<a name="493" href="#493">493</a>                 
<a name="494" href="#494">494</a>             }
<a name="495" href="#495">495</a>             
<a name="496" href="#496">496</a>         }
<a name="497" href="#497">497</a> 
<a name="498" href="#498">498</a>     }
<a name="499" href="#499">499</a>     
<a name="500" href="#500">500</a>     <strong>private</strong> <strong>static</strong> Type[] getActualTypeAttributes(Class&lt;?> clazz, Class&lt;?> supertype) {
<a name="501" href="#501">501</a>         <em class="comment">/*</em>
<a name="502" href="#502">502</a> <em class="comment">         * The superclass is not necessarily a ParameterizedType even if it has type</em>
<a name="503" href="#503">503</a> <em class="comment">         * parameters! This happens if a user fails to specify type parameters for a</em>
<a name="504" href="#504">504</a> <em class="comment">         * class and ignores the warning, e.g.</em>
<a name="505" href="#505">505</a> <em class="comment">         * </em>
<a name="506" href="#506">506</a> <em class="comment">         * class MyList extends ArrayList</em>
<a name="507" href="#507">507</a> <em class="comment">         * </em>
<a name="508" href="#508">508</a> <em class="comment">         * In this case, the superclass ArrayList.class has one type parameter, but</em>
<a name="509" href="#509">509</a> <em class="comment">         * MyList.class.getGenericSuperclass() returns a simple type object!</em>
<a name="510" href="#510">510</a> <em class="comment">         * </em>
<a name="511" href="#511">511</a> <em class="comment">         * In this case, no type assignments take place, so the actual arguments are</em>
<a name="512" href="#512">512</a> <em class="comment">         * simply the type parameters.</em>
<a name="513" href="#513">513</a> <em class="comment">         */</em>    
<a name="514" href="#514">514</a>         Type genericSupertype = tryGetGenericSupertype(clazz, supertype);
<a name="515" href="#515">515</a>         <strong>return</strong> ((genericSupertype instanceof ParameterizedType)
<a name="516" href="#516">516</a>                 ? ((ParameterizedType) genericSupertype).getActualTypeArguments()
<a name="517" href="#517">517</a>                 : supertype.getTypeParameters());        
<a name="518" href="#518">518</a>     }
<a name="519" href="#519">519</a>     
<a name="520" href="#520">520</a>     <strong>private</strong> <strong>static</strong> Type tryGetGenericSupertype(Class&lt;?> clazz, Class&lt;?> supertype) {
<a name="521" href="#521">521</a>         
<a name="522" href="#522">522</a>         <strong>if</strong> (!supertype.isInterface()) {
<a name="523" href="#523">523</a>             <strong>return</strong> clazz.getGenericSuperclass();
<a name="524" href="#524">524</a>         } <strong>else</strong> {
<a name="525" href="#525">525</a>             Type[] genericInterfaces = clazz.getGenericInterfaces();
<a name="526" href="#526">526</a>             
<a name="527" href="#527">527</a>             <strong>for</strong> (<strong>int</strong> i = 0; i &lt; genericInterfaces.length; i++) {
<a name="528" href="#528">528</a>                 Type interfaceType = genericInterfaces[i]; 
<a name="529" href="#529">529</a>                 
<a name="530" href="#530">530</a>                 <em class="comment">// there is no guarantee that *all* the interfaces are generic</em>
<a name="531" href="#531">531</a>                 <strong>if</strong> ((interfaceType instanceof ParameterizedType) 
<a name="532" href="#532">532</a>                         &amp;&amp; (((ParameterizedType) interfaceType).getRawType().equals(supertype))) {
<a name="533" href="#533">533</a>                     <strong>return</strong> interfaceType;
<a name="534" href="#534">534</a>                 } <strong>else</strong> {
<a name="535" href="#535">535</a>                     assert (interfaceType instanceof Class) : interfaceType;
<a name="536" href="#536">536</a>                     
<a name="537" href="#537">537</a>                     <strong>if</strong> (interfaceType.equals(supertype)) {
<a name="538" href="#538">538</a>                         <strong>return</strong> interfaceType;
<a name="539" href="#539">539</a>                     }   
<a name="540" href="#540">540</a>                     
<a name="541" href="#541">541</a>                 }
<a name="542" href="#542">542</a>                 
<a name="543" href="#543">543</a>             }
<a name="544" href="#544">544</a>             
<a name="545" href="#545">545</a>         }
<a name="546" href="#546">546</a>         
<a name="547" href="#547">547</a>         <strong>throw</strong> <strong>new</strong> AssertionError(<span class="string">"Unable to find generic superclass information for class '"</span>
<a name="548" href="#548">548</a>                                  + clazz + <span class="string">"' and superclass/-interface '"</span> + supertype + <span class="string">"'"</span>);
<a name="549" href="#549">549</a>     }
<a name="550" href="#550">550</a> 
<a name="551" href="#551">551</a>     <strong>private</strong> <strong>static</strong> List&lt;Class&lt;?>> getActualAssignments(
<a name="552" href="#552">552</a>             TypeVariable&lt;?>[] typedClassTypeParams,
<a name="553" href="#553">553</a>             Map&lt;TypeVariable&lt;?>, Class&lt;?>> typeAssignments) {
<a name="554" href="#554">554</a>         <strong>int</strong> numTypedClassTypeParams = typedClassTypeParams.length;
<a name="555" href="#555">555</a>         List&lt;Class&lt;?>> actualAssignments = 
<a name="556" href="#556">556</a>             <strong>new</strong> ArrayList&lt;Class&lt;?>>(numTypedClassTypeParams);
<a name="557" href="#557">557</a>         
<a name="558" href="#558">558</a>         <em class="comment">// for entries that could not be resolved, null should be returned</em>
<a name="559" href="#559">559</a>         <strong>for</strong> (<strong>int</strong> i = 0; i &lt; numTypedClassTypeParams; i++) {
<a name="560" href="#560">560</a>             actualAssignments.add(typeAssignments.get(typedClassTypeParams[i]));
<a name="561" href="#561">561</a>         }
<a name="562" href="#562">562</a>         
<a name="563" href="#563">563</a>         <strong>return</strong> actualAssignments;
<a name="564" href="#564">564</a>     }    
<a name="565" href="#565">565</a>     
<a name="566" href="#566">566</a> }
</pre>
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